I installed and configured PostgreSQL in one of our client computers and found the problem of TCP/IP.

When a client machine tried to connect the PostgreSQL Server, it got an error like “psql:could not connect to server:Connection refused”.

If you need to the connect all clients with PostgreSQL server, you should perform the below two actions.

Add client IP-Address ranges into pg_hba.conf :
pg_hba.conf is a configuration file which controls the Client Authentication. This file automatically installed when the data directory is initialized.

Below is a default entry in pghba.conf file.

# IPv4 local connections:
host    all         all         127.0.0.1/32          md5
# IPv6 local connections:
host    all         all         ::1/128               md5

In our example, we have a client, IP-Address which is “10.0.0.12”. If you require connecting this client with PostgreSQL Server, please add below entry in the pghba.conf and after that save the file and restart PostgreSQL Service.

host    all         all         10.0.0.12/24    md5

Another method is to change listen_addresses parameter in postgresql.conf :

In the PostgreSQL configuration file (postgresql.conf), by default listen address is “localhost” like,

listen_addresses = 'localhost'

Please change this parameter value from ‘localhost’ to ‘*’ so that all clients can connect from different networks.

listen_addresses = '*'